Counter-balanced telescopic support



Jan. 26, 1965 A. NASJLETI COUNTER-BALANCED TELESCOPIC SUPPORT 3 Sheets-Sheet 1 Filed June 21, 1965 Mai-E.

ENTOR ATTORNEY5 Jan. 26, 1965 A. NASJLETI COUNTER-BALANCED TELESCOPIC SUPPORT 3 Sheets-Sheet 2 Filed June 21, 1963 Jan. 26, 1965 A. NASJLETI 3,167,289

COUNTER-BALANCED TELESCOPIC SUPPORT Filed June 21, 1963 s Sheets-Sheet 5 United States Patent Ofifice This invention relates to a counter-balanced telescopic supporting arrangement for tables and the like and more particularly it refers to a telescopic column-like member, one end portion of which usually rests on the floor, either directly or through suitable legs, for instance of the tripod type, while the other end portion is provided with a supporting member, such as the board of a table, the seat of a chair and the like.

The arrangement is so counter-balanced that the adjustment of the height of the supporting member may be manually performed, without the operator having to exert a substantial pressure, taking into account the weight which is supported by the supporting member.

Ina preferred embodiment, when a height decreasing adjustment is to be performed, the additional force required is minimum, while a height increasing adjustment may be carried out without additional force. Even when the weight is removed from the supporting member and the clamping means which maintains the telescopic arrangement in any predetermined position is opened, the expansion of the telescopic arrangement towards its maximum height position is gradually reached, without any bounce or similar sudden movement.

. One of the preferred uses of the present invention is for t'ables for television sets, in which event an addi tio nal advantage is that the arrangement is so conceived that it may be rotated about its longitudinal axis. Most of the tables and frames for television sets, as nowadays manufactured, are not graduable in height and those which are, usually require that the television set is removed for carrying out any height adjustment.

, Tables with supporting members defined by the board, which are rotatable about the vertical axis are known, but they all have an extra bearing and stub-shaft arrangement for that purpose while the present invention provides this additional feature without requiring further mechanical means.

Since television sets are of rather delicate nature, to

i provide a height graduable table which may be smoothly cludesload compensating means adapted to substantially counter-balance the preloaded resilient means. The first and second pairs of telescopic members being interrelated and one of the pairs of telescopic members including blocking means for blocking the arrangement at any desired height.

In order to facilitate the comprehension of the present invention, reference will now be made to preferred embodiments in relationship to the accompanying drawings, wherein:

FIG. 1 is a perspective view, partially in section, of a counter-balanced telescopic supporting arrangement, according to the present invention.

FIG. 2 is a longitudinal section of the embodiment shown in FIG. 1.

FIG. 3 is a perspective view of a portion of the arrangement, showing in detail the clamping means.

FIG. 4 is a longitudinal section, in larger scale, of the lower end portion of both pairs of telescopic tubular members and accessories.

FIG. 5 is a longitudinal section, in larger scale, of the upper end portion of the inner tubular member of the inner pair of telescopic tubular members.

FIG. 6 is a longitudinal section, in larger scale, show ing the upper end portion of the arrangement.

FIG. is a side elevation of the plunger.

FIGS. 7A and 7B are side elevations of alternative embodiments of the plunger.

FIG. 8 is a bottom plan view of the plunger as seen along lines VIIIVIII of FIG. 7.

FIG. 9 is a top plan view of the plunger as seen along lines IX-IX of FIG. 7.

FIG. 10 is a schematical illustration of another embodiment.

As may be seen in FIGS. 1 and 2, wherein a first and preferred embodiment is shown, the latter is designed as a table for a television set and comprises a supporting member consisting of a board 11 for a television set (not shown). The board 11 is supported by a counter-balanced telescopic supporting arrangement 13 having a bracket 14 (see also FIG. 3) defining a plate 15 integral with a bushing 16 having recesses 17 in which the upper end of legs 18 (only one shown in FIG. 3) are mounted, which legs support the entire arrangement.

The counter-balanced telescopic supporting arrangement 13 comprises a first pair of telescopic tubular members, also called for this embodiment outer pair of telescopic tubular members, consisting of an outer lower tubular member 19 and a telescopically fit upper inner tubular member 20 (FIGS. 1 and 2). Thus the first or outer pair of telescopic tubular members are identified by reference numerals 19, 20.

The counter-balanced telescopic supporting arrangement 13 comprises a second pair of telescopic tubular members also called for this embodiment inner pair of telescopic tubular members, consisting of an outer upper tubular member 21 and a telescopically fit lower inner tubular member 22. Thus, the second or inner pair of telescopic tubular members are identified by reference numerals 21, 22.

Bushing 16 of bracket 14 comprises in its lower portion a shoulder 23. (FIG. 2) against which butts the upper end of the outer lower tubular member 19 which is fit into the bushing 16 by embossing a flange portion thereof through each of the perforations 24 (see also FIG. 3) within the recessed portion 17. The shoulder 23 is of larger cross-section than the width of the wall of the outer lower tubular member, 19, as is clearly shown in FIG. 2 so that the inner portion of shoulder 23 defines a circular inner abutment for the lower outwardly embossed end portion 20' of the telescopically fit upper inner Patented Jan. 26, 1965 tubular member 20'which, A position, entersin abutting contact with said circular inner abutment of shoulder 23 to avoid the telescopically fit upper inner tubular member 20 may be expelled out .of

the outer lower tubular'member'19; The outer diameter; 'of the lower outwardly embossed end portion 20' is slightly smaller than the inner diameterof the outed lower when in its maXimumdiste nded V diameter than the' first washer 37 and retained in place by counter-nut 400i largerdiameter than nut 36. 1 It is tubular member 19 and obviously likewise the outer diameter of the telescopically fit upper inner tubular member. 20 is smaller than the inner diameter of theouter lower tubular member 19, so that the telescopically fit 7 upper inner tubular memberZO may smoothly move.Within the outer lower tubular member 19. is

. To provide a good guidance between the telescopically fit upper inner tubular member 20 and the outer lower tubular member 19, the tubular'member is guided and retainable in any position by a clamping device25, through which the tubularmember 2.0 may slide. Thus, in any position of the telescopically fit upper inner tubular I member 20 withregard to the outerlowertubular rn'erne ber. 19, tubular mmeber 20 is guided by the lower out-.

vice 25.

wardly embossed endportion20' and the clampingfde bushing 16 and clamping ldevice ZSJ-The} clamping: 'de- Bracket 14 is'aone-piece castedmeniber including the;

apparent from FIG. 4' that the width of second washer 37 issubstantially equal-to the'height of upwardly projecting centralguide member 36' and that the width of the second washer 39 is substantially equal to the height of nut 36., The counter nut 40, besides of retaining the second washer 39,-actsalsoas acounter-nut'for'nut 36.

' The diameter ofgthe second washer '39 -is such that the outer portion thereof rests on base rim 19.

Theupper end portion ofjthe telescopically fit lower inner tubular member22 ,(FIG. 5) comprises a sealing '1 consisting of a seal'member 41, usually made of neoprene' having a central. perforation and being housed betWeena pair of. washers, 4.3- h Sealing 1 .3 is press-fitted between the embossed neck'portion 44 and the embossed lid portion 45 of the telescopically fit lower inner tubular member 22. Z I

The lower inner tubularinember 22, asalready stated,

. bular members 22,21 and: the upper por-tion of tubular vice 25 :is p'artially, separated from plate, 15 by a-horizontal cut 26 which almost-reachesthe rear posit: 25A which is integral withplate 15. The rear post- 25A is integral with a pair or substantially semicircular jaws 25B,,25B' ending in a pair of clamping tonguesZSC, 25C

25C, 25C are spaced apartffrom plate-15'. A clamping projecting in diametrically; opposite direction withl re gard .torear post 25A, .Jaws 25B, 25B' and clamping tongues screw'27 is rigidly and stationarily mounted ,bymeans of blocking pin 28 in clamping tongue 25C. Clamping screw 27"projects through clamping tongue-25C and a.

manually operable pressuremember 29: is screwed on the outwardly projecting portion on clamping screw 27. A resilient. split expansion ring .30 is; housed- -Within the clamping device 25. andt'ends" to. resiliently space apart clamping tongues 25C, 5 .T us b QP a n Lthe wa stem 49 is screwed, ,th e free 'end o'f which (FIGS. 2 and member 22 isslidably lio us'edin the loweri-portionof the outer upper tubular member-2 1, the lowerendofwhich is open atits end." Theyupper end of tubular member 21' (FIG; '6) is permanently linked-"to, the. foot 46' of v awasher head 46 means of an inwardly 'embossed neck por-' *tiQnZYentering in a pertinent annularfrec'e'ss, in said foot 46'. The ppperportion of the washerhead 46 is of larger "diameterthan said foot 46 and defines by its lower face an abutmentfor the upper edge of the outer upper tubular n ember 21 aswell' as anab itment platform for the pertiment en of helical spring 38, the other end of which rests on the firstwasher' 3'1 (FIG. 4) I A central hon- 47 defines in the upper'portiqn of washer-head 46 a1:nut seat,fhousi ng a nut 48 intowhich 5 7 supponts'a p i pgrso; ".Th e plungerit) consists of an 'upper small diametenwasher 51 and "a lower regular polygonal/washer '52 which in Ithisernbodinienfis an hexagonal washerpt he diagonals 'oflwhich are slightly smaller than :the inner diameter of the'lowe'r inner tumanually operable pressure member 29,j clamping .tonguej 25C Willi'fbe either pushed towards or away from 'clamping tongue 25C, thereby respectively clamping'or un clamping the telescopically fit upper-inner tubular mem-.

ber 20 whereby, as will belater betterseenithe height of.board1 1 with regard to bracket 14 may be changed.

The upper n po on. of tub l r'membe .0 IGS- 1, nd 6) pen. nd a pid suppo ng memb 31 is p e ab y p s fiton-t esou acet eof, Spiders 31' support the board 11. retainer pin: 32

bular mei r iber 2 2, (FI GQ 2) and are obviously consider:

ably longer tha'n the diameter of said. washer 51. Be,

- tween the upper. small diameter washer 51' and the lower regular polygonal' washer "52 (FIG. '7 a'resilienf plunger rneinber 53is fitgted on stem 49and having a circular Q f lQ 1 the i i pf h h r iibstei a q l to the inner diameter of the" lower innerftubular member passes through the upper: end portion of tubular member ,20 and is mounted in; the spidersupporting' member 31, and the purpose of which will be later explained.

The lower end portion of the outer lower tubular member 19 (FIGS; 1,' 2 and 4) is inwardly bent,;de finingv a base rim 19' for. linking means 33 of the lowerEehd por- 22, bu t havin g atllealst one'land in theembodiment shown, two bleeding flsectionsfldefined in'this embodimen t by cute uysehfly i red fom' trlo i r a w r sth upperbase "of resilient plunge member 3, as best shown in FIG: '7 at the5 cutotf portion 53 V A; fluid 54 (FIG; 2) is housed within the. second or innerpair'of telescopidtubular members 22 'and 'it tion 22 of the telescopically fit lower inner tubular mem v ber 22 to'besuppo rted by the baseirirn 19'.' The lower end portion 22, similarly asbase rim119 is inwardly bent andpenetrates into a gasket 34j, preferably made of rubber, through which a large head anchoring screw 35 passes, the'hea d 35' of which butts against'the upper 's'urE face of g'asketv34. A nut-36 including an upwardly projecting central guide member-36' isscrewed on the large head anchoring screw 35 and pressesithe gasket 34' against 1 head 35" at the same time as it supports a'first'washer 37 which has two functions"; It presses the, inwardly em-i l bossed neck portion 22 in sealing relationship into gasket 34 and since it, is of larger diameter than the diameter,

of the telescopicallyfit lower inner tubular member ZZ; it, provides an a utting. surface for a helical spring 38,

: coiled around the, telescopically fit lower inner tubular member 22 and to which reference will be made lateron. A second washer v39 surrotu1ds nuts 36 and is of larger can alreadybe apprecieted'that wher'i board '11 .is'inoved toward bracket 14, ft hatfthe resilient plunger member 53 w ll flexupwardly, asshown in dotted lines in 7,

due to the fact thatthe upper washer SIhes a small diamcter in comparison with the resilient plunger member 53,

thereby facilitating the'downwardmovement of board 11;

. while if a movement in oppositedirec'tion-is performed, thelowerregular polygonal washer 52,".due to its larger,

cross sectional wilLmaintain resilientplunger member 53 open; as will be. later betterunderstood. I If desired, 'thefresiliencplunger member 753 A (FIG. 7A) may be of circular ,cross section of substantiallythe same diameter as the innerdiameter of tubular member .22, in which event,.-preferablY; a bleeding bore 159 passes therethrough',

forms part of thesecondor inner pair of telescopic tuincreasing the counter-balance.

If the diameter of the plunger member 153 (FIG. 7B) is somewhat smaller than that of the lower inner tubular member 22, a bleeding passage is defined between the inner wall of the tubular member 22 and the periphery of plunger member 153. In that event the upper small diameter washer 151 is slidably arranged on the smaller diameter stub pin portion 149' of stem 149, so that when fluid pressure is exerted on washer 151 in downward direction as indicated by arrows 160, washer 151 tends to slide towards the lower stationarily mounted washer 152 which may be circular in cross section, and the resilient plunger member 153 is radially expanded, as indicated by arrows 161, thereby decreasing the bleeding passage and Since helical spring 38 is preloaded, even in the maximum distended position of the counter-balanced telescoping supporting arrangement, 1.e.:

When the lower outwardly embossed end portion 20 is in abutting contact with shoulder 23, helical spring 38 always urges washer head 46 into contact with retainer pin 32 (FIG. 6), whereby the purpose of retainer pin 32, previously described, is now apparent.

The preload of helical spring 38 is such, that it tends to move board 11 upwardly, upon clamping device 25 being opened, with a force which is slightly larger than the weight which board 11 has to support, bearing in mind the breaking eifect which provides the plunger 50 with its bleeding arrangement 53, 53".

On the other hand, if board 11 is to be lowered towards bracket 14, only a slight force will be required to be exerted on board 11 in addition tov the weight which is supported by board 11, since the breaking effect of plunger 50 is substantially reduced in view of the fiection of resilient plunger member, 53 as described in connection with FIG. 7.

Conveniently. a-rubber ring 55 (FIG. 2) is fit on the telescopically fit upper inner tubular member 20 and in abutting contact with the lower end of the spider support ing member 31, so that upon lowering board 11 to .the maximum telescoped or collapsed position, said rubber ring 55 will cushion the impact on the upper surface of clamping device 25.

It will be apparent that the clamping device 25 may clamp and retain tubular member 20 in any desired position within the two maximum limit positions and that likewise the board 11 with the tubular member 20 may be rotated about the longitudinal axis of the arrangement, as soon as the clamping device 25 is unclamped.

Asto the way of assembling the arrangement, in first instance the nut 48is unscrewed from stem 49 and the stem 49 with the plunger 50 is inserted through the lower open end into the lower inner tubular member 22 and the upper end of stem 49 is passed through washer 42, seal member 41, washer 43. Thereafter, the head 35' of large headed anchoring screw 35 with the gasket 54 mounted thereon is fit into the lower end of tubular member 22 and thereafter the lower end portion 22' is embossed inwardly, as shown in FIG. 4.

At the same time the washer head 46 is fit into the upper end of outer upper tubular member 21. Thereafter, the tubular member 22 is partially inserted by its upper end portion into the lower end portion of outer upper tubular member 21 and the free end of stem 49 is passed through central bore 47, so that nut 48 may be screwed onto stem 49 and housed in the nut seat of bore 47.

Thereafter, helical spring 38 is slid onto the inner or second pair of telescopic tubular members 21, 22 until it abutts against washer head 46 and preloaded so that the first washer 37 with nut 36 may be screwed onto large headed anchoring screw 35 and maintain the assembly in preloaded condition. It is obvious that before fitting lower endportion 22 onto gasket 34, the fluid 54 has to be housed into the pair of telescopic tubular members 21, 22.

The inner or second pair of telescopic tubular members 21, 22 is then loosely housed in the telescopically fit upper inner tubular member 20 and the tubular member 20 by lower outwardly embossed end portion 20 is then inserted through the upper end of outer lower tubular member 19 until the second washer 39 abutts against base rim 19. Thereafter, the bracket 14 is fit over the upper end of the telescopically fit upper inner tubular member 20 and inserted likewise over the upper end of outer lower tubular member 19 until shoulder 23 enters in abutting relationship with the outer lower tubular member 19. Thereafter, the upper portion of outer lower tubular member 19 is linked with the perforations 24 of bushing 16, as is already well known in the art.

Finally, the spider supporting member 31 with retainer pin 32 is pressure fit onto the upper end portion of the telescopically fit upper inner tubular member 20, whereby the entire arrangement is assembled and ready for use.

Although in thi embodiment the second pair of telescopically tubular members 21 and 22 are housed within the first pair of telescopic tubular members 19, 20, it will be evident that this is not a fundamental requirement. In the embodiment shown in FIG. 10, the second pair of telescopic tubular members 121, 122 is arranged adjacent the first pair of telescopic tubular members 119, 120. Tubular member 121 is linked by arm 156 to tubular member and likewise tubular member 122 is linked by arm 157 to tubular member 119. The upper end of tubular member 120 is provided with a spider supporting member 131 supporting a board 111, for instance of a table and the tubular member 119 is provided with a bracket 114 having at least one leg 118 in case the arrangement, as previously stated, forms part of a table which may for instance have four legs.

The second pair of telescopic members 121, 122 houses a hydraulic plunger arrangement of the type of plunger 50 described in connection with the first embodiment, while the first pair of telescopic tubular members 119, 120 houses a preloaded spring 158 of the type of spring 38.

Although two embodiments of the invention have been illustrated and described in detail, it is to be expressly understood that the invention is not limited thereto. Various changes can be made in the design and arrangement of the parts without departing from the spirit and scope of the invention as the same will now be understood by those skilled in the art.

I claim:

1. A counter-balanced telescopic supporting arrangement for tables and the like, comprising a first pair of telescopic tubular members and a second pair of telescopic tubular members, said first pair including preloaded resilient means urging said first pair of telescopic members apart, said second pair oftelescopic tubular mem bers including load compensating means adapted to substantially counter-balance saidpreloaded resilient means, said first and second pair of telescopic members being interrelated and one of said pair of telescopic members including blocking means.

2. A counter-balanced telescopic supporting arrangement for tables and the like, comprising an outer pair of telescopic tubular members and an inner pair of telescopic tubular members, said outer pair of telescopic tubular members having a first end and a second end, said inner pair of telescopic tubular members having a third end and a fourth end, said first end and said third end as well as said second end and said fourth end being linked together, a preloaded spring arranged between said inner and outer telescopic tubular member and in abutting relationship with said third and fourth end adapted to urge said pairs of telescopic tubular members apart, said inner pair of telescopic tubular members including load compensating means adapted to substantially counterbalance said preloaded spring, and manually operable 7 blocking means operable on of said outer pair of telescopic tubular members.

V 3. The supporti'ng arrangementas claimed in claim 2,

wherein legs are 'cdrinected to said blocking means; for supporting' the arrangement in s'pacedflapart relationship I floor and. saidfirsteird being provided with a from'the u 7 v suppo t n m m e qr l 'oard- I a v 4. A eounterrbialanced telescopic supporting arrange m t fo s les a e. ike cqmpr s ns. an oute P f ieiescopie tubular members' and an innerf p'airot tele s'copic? tubular members, said outer pair of telescopic one of the tubular members" e perforation, an outer lower tubularrriember fit into said;

bushing and in abutting relationship with saidshoulder,

tubular I Iwinbe'rs havingla first endand asecond end,

' sa d @1 P l sco ic tubu a' l members ha g a third end and a fourthend said first-end vand said thirdend ,7

as well, as'said second end and said 'fourth end; being linked together, a,preloadedspring arranged'between said inner andiouter telescopic tubular members, and inabutting relationshipwith said third and fourth end to urge said pairs of tel [copic tubular-members apart, said inner 1 pair of telescopic} tubflilar 'mernbers, comprising a first defining a 'Perforation,;said bushing having, ashoulder increasing the diameter of the tlower portion of saidsaid"shoulder havirrg a'v larger cross-sectional area than the width of 'said .o-uterfloweritubular member, so that an abutment, a telescopicallyfit upper inner tubumber partially" slidably' housed "within said v outer lower tubular member and projecting through said perforaa tion of'said braeket, saidttpper inner'tubuar member have ingja lower" outwardly embossed end portion capable oi enteringiri'abuttingrelationship with said abutmentof said shoulder, said clamping device being capable of blocking said upper inner tubularmember in any position, said outer lower tubular member having a base, rim, said upper inner-tubular member having a freeend portion, a spider; supporting mmeber fit on said free end portion, a retainer 7 pin' passin-g through said spiders'upporting member and tubular member defining said fourth end and having a perforated seal at its opposite end, telescopically arranged in a second tubular member defining said third end, a plunger slidably arranged in said first'tubular membenfa stem connected to saidplunger and projecting -tb rou'gh said seal'of said first tubular, member into said second 1 tubular member and bein grigidly connected to said third end, a'flu'id fhofu'sed in'said first tubularrnember, said plunger definingat least one bleeding passage, said fluid,

plunger :and bleeding passage being adapted. to substantially countenbalancesaid preloaded spring, and manually" operable'bloeking 'meaus'o'perable on: QD CQ-Of the tubular members of said eouter pair of telescopic tubular members. 5. The supporting'a'rrangement as claimed incla im 4,

wherein said plllng i"comprises an upper small crosssectio'nal washer mounted on said stem, a lowerjla r'ger crosssectional washer mounted on said stem; a resilient plunger member mounted between said upper and said,

lower washers, the cross-sectional area of said lower washer being as a maximum equal to, the cross-sectional area of said resilient plunger member," said'plun'ger memh having a e t one uto Port o defi in d dingpassage said resilient plun'g'er'member being adapte to fiextewa s sa di er a her to incre t le d:

ing passage when moying in the direction of compression of saidpreload si spring. l i

6; The supporting arrangement as claimed in'cl'a'iin 4,

wherein said plunger comprises an upper small, cross ect ona washer m unted on, aid t m a lowe larger crossseet-ional washer m nted on said stempa re li n p un er me e: m m e n s pper'and s id said firee end portion, said spider sup'portingmember being adated to-suppoit-a board,la lowerinner tubular member resting on said base rimand being sealed therefrom,

saidslowerfinner tubularmember beinghoused in said outer lower tubular member and said outer upper tubular membe said-1mm me tu la memb being e scopically'fit-in'said' outer upperlf'tubular member, said outer upper tubular; member beinghoused in said upper inner tubularg'member, said outer upper tubular member having a free end/a washerhead'includ'ing afoot fit into 'said free end and in abutting relationship with said reta'm'er pin, said washer head and foot being perforated and defining a nut seat, 'a nutin said nut seat, said telescopically fit lower inner tubular member having an upper end portion defining a perforated seal, a plunger slidably housed In said telescopically fit lower inner tubular member, a

stem integral with said plunger and projecting through saidlast mentionedseal, said stem having'a screw thread- 5 ed free end passingthrou-gh said'perforated washer head and foot andscrew'ed into said nut, a fluid housed in ,said telescopicallylitlower innerftubular member, said plunger including a bleedingxpassage, a washer connected lower washers, said plunger member having at least one o ne eas the ble portion and spaced away from uppersmallcross sectional-washer, a resilient radiallyexpaudable plunger,

' wherein saidpl unger comprises an upper small diameter Was e m nted, o id st mL l e l 'r y al 5.5

to said telescopically?v fit lower inner tubularmember and rest ng on said base rim, a preloaded compression spring coiled around said outer upper tubular member and tele- 'scopica lly' fitlofwer inner tubular member'and abutting 'againstsaid last mentioned washer and against said washer head thereby urging-said tubular members apart.

The uppo tin ar a me siela med n la m "wherein said bushing" defining 'outsidef recesses, legs o i n saws/ e e es e or u -Pa t n Sa d "rangement in spaced apart relttionshipfr'biir' thefloor.

1.0. The" supporting arrangement 'as'claimed in claim 8,

washer mounted I on said stemf'a resilient cylindrieal l n rniember mo e sns i r p sm l meter washerran'd said lower regular, polygonal washer-rand in contact-- therewith the diagonal of saidjlower regular polygonal-washer being substantially egu alto the diameter member mounted between :said upper and said lower washers, the diameter of said plunger member in uncoma pressed state, being smallertharn the inner diameter of said first tubular member, said resilient plunger member being [adapted to flex towards said upper Washer to increase the bleeding passage when movingin the direction ot compression of said preloaded spring. Y V V a 8. A counter-balanced"teleseopie supporting "arrange ment for tables and the like, comprising a bracket defining a platehaving two sides, 'a bushing integnal with'on one side of 'said plate and a clampingdevice integral with h t e l' d s i da g ev se l t and b sh n of said resilient plunger member, said plunger member i gl s 0116 1f pqrt j fi' lop d o t e l we i il ;bo vs n wa he o ards' 's i rupb Small diameter-washer to define said bleeding passage-said resilient plunger member being adapted to flex towards said upper ,r smallvdiameter washer to increase the bleeding passage when-moving in the direction of compression of said preloaded spring.

all. The supporting. anrangernentas claimed in claim 8, {wherein afresilient ringis mounted on said telescopically a fit --1 1pper:v inner tubular member and in abutting relationship With'said spider sjupporting member. v 1 j 12. The supporting ai r'angement as claimed in claim 8 wherein clamping device, plateyandfbushingare an integral'rnember, said clamping device comprising a rear within said outer lowertubular member said shoulder.

post, a pair of jaws integral with said rear post each end ing into a clamping tongue, said clamping tongues and jaws being spaced apart from said plate and defining part of the height of said perforation, a resilient split expansion ring in said jaws urging said jaws and tongues apart, said telescopically fit upper inner tubular member being likewise slidably arranged within said part of said perforation defined by said resilient split expansion ring, a clamping screw passing through both of said clamping tongues, a blocking pin in one of said clamping tongues blocking said clamping screw against rotation and a manually operable pressure member screwed on said clamping screw and in abutting pressing contact with the other of said clamping tongues.

References Cited in the file of this patent UNITED STATES PATENTS Davis July 10, 1928 McElroy Apr. 30, 1935 Buckstone May 26, 1936 Lageruall Sept. 5, 1939 Greppin Dec. 6, 1949 Howarth et a1 Feb. 6, 1951 Paulson May 18, 1954 Etherton Aug. 2, 1955 FOREIGN PATENTS Australia July 6, 1956 

1. A COUNTER-BALANCED TELESCOPIC SUPPORTING ARRANGEMENT FOR TABLES AND THE LIKE, COMPRISING A FIRST PAIR OF TELESCOPIC TUBULAR MEMBERS AND A SECOND PAIR OF TELESCOPIC TUBULAR MEMBERS, SAID FIRST PAIR INCLUDING PRELOADED RESILIENT MEANS URGING SAID FIRST PAIR OF TELESCOPIC MEMBERS APART, SAID SECOND PAIR OF TELESCOPIC TUBULAR MEMBERS INCLUDING LOAD COMPENSATING MEANS ADAPTED TO SUBSTANTIALLY COUNTER-BALANCE SAID PRELOAD RESILIENT MEANS, SAID FIRST AND SECOND PAIR OF TELESCOPIC MEMBERS BEING INTERRELATED AND ONE OF SAID PAIR OF TELESCOPIC MEMBERS INCLUDING BLOCKING MEANS. 